﻿174 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 102 



KEY TO SPECIES OF THE GENUS EURYBATA OSTEN-SACKEN 



1. Dark fasciae of wing uniform and straight ; fore tibiae whitish ; mesonotum 



wholly shining or very indistinctly pruinose; male: copulatory fork with 



two long divergent prongs (fig. 74, e) E. hexapla Osten-Sacken 



The wing fascia distad of tp (fifth from base of wing) projecting basad be- 

 tween third and fourth veins or all fasciae broken, forming a checkered 

 pattern 2 



2. Only the fifth fascia uneven ; fore tibiae blackish except at tips ; mesonotum 



with distinct prescutellar brown-pruinose spot ; male: copulatory fork with 



short arms inflexed at ends (figs. 74: f, g) 15 E. nigritibia, new species 



Wings with checkered pattern ; fore tibiae only a little brownish distomedi- 

 ally; mesonotum wholly shining; male: copulatory fork with short arms, 

 knobbed at tip and slightly convergent (fig. 74, h) E. tessellata, new species 



13. EURYBATA HEXAPLA Osten-Sacken 



FiGUBE 74, a, b, e 



Eurylata hexapla Osten-Sacken, Berliner Ent. Zeitschr., vol. 26, p. 206, 1882. — 

 Bezzi, Philippine Journ. Sci., vol. 2, ser. 3D, p. 155, 1917. — Feey, Not. Ent., 

 vol. 7, p. 7, 1927. 



Philippine Islands : Luzon (Mount Maquiling) , Baker collector, 12 

 specimens; (Ube Laguna), May 12, 1924, R. C. McGregor collector, 2 

 specimens; Tayabas (Malinao), Baker collector, 1 specimen. 



Bezzi lists Los Bafios and Mount Maquiling as localities, probably 

 from part of the same material that is still in the Museum, but I saw 

 no specimens from Los Banos, a town at the foot of Mount Maquiling; 

 Frey lists (Mount) Banahao (Tayabas) and Surigao in Mindanao. 

 The latter locality is the source of the type of E. tessellata^ new species. 

 Hennig did not see specimens. 



The following characters will assist in distinguishing E. hexafla 

 from the new species : Arista short plumose on barely the basal half ; 

 third antennal joint 2.5 times as long as broad, blackish except at 

 base; fore legs yellow, except apical half of femur and apical joints 

 of tarsi ; middle and hind femora with brownish preapical band ; one 

 sternopleural bristle; one posterior notopleural bristle; one dorso- 

 central bristle ; wing fasciae all even and straight ; pterostigma very 

 small ; apical wing spot as long as width of first posterior cell at base 

 of spot; copulatory fork as figured (fig. 74, e). 



14. EURYBATA NIGRITIBIA, new species 



Figure 74, f. g 



Male. — Length, 10 mm. Differs from E. hexapla in having yellow- 

 ish brown antennae, the third joint only about 1.5 times as long as 

 broad; the shining mesof rental wedge extending as a narrow strip 

 all the way to the anterior ocellus; fore femora colored similarly to 



